I read a book series about 11 years ago and can't remember the name. I remember that there was a royal family that was assassinated and a young guy found out he was a wizard. I remember him going back in time and learning about a great wizard (I think Bron) and figuring out he was that great wizard. He then discovers alchemy and moves to the moon(or a planet) to pass time until he needs to be born again. I was like 8 so could be way off.
Maybe correct information The royal family died in a carriage accident or something on he way to a picnic. There was a huge wizard tower near the castle. Magi was banned or outlawed or forgotten or scarce. Brons symbol was a hammer in a circle? Maybe.